ft_atoi.c


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#include "libft.h"

int
ft_atoi (const char *nptr)
{
  int sign;
  int result;

  result = 0;
  sign = 1;
  // Skip isspace() characters: space, \t, \n, \v, \f, \r.
  while (*nptr == ' ' || (*nptr >= '\t' && *nptr <= '\r'))
    nptr++;
  if (*nptr == '-' || *nptr == '+')
    {
      if (*nptr == '-')
        sign = -1;
      nptr++;
    }
  while (*nptr >= '0' && *nptr <= '9')
    {
      result = result * 10 + (*nptr - '0');
      nptr++;
    }
  return (result * sign);
}